/Engine/Source/Runtime/Experimental/Chaos/Public/PBDRigidsSolver.h
Update the particles parameters based on field evaluation
void FieldParameterUpdateCallback ( [Chaos::FPBDPositionConstraints](API\Runtime\Chaos\Chaos\FPBDPositionConstraints) & PositionTarget, [TMap](API\Runtime\Core\Containers\TMap)< int32, int32 > & TargetedParticles )